docs: align development docs with current code behavior

src/decisions/DECISIONS_2026-02-26T02-43-51Z.md

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+---
+agent: docs-alignment-agent
+cadence: daily
+run-start: 2026-02-26T02-43-51Z
+---
+
+# Decisions
+
+## Decision 1
+Use code reality as source of truth for prerequisites and defaults.
+
+### Rationale
+`pyproject.toml` and `ConfigManager` provide authoritative runtime constraints/defaults.
+
+## Decision 2
+Fix dead links by pointing to existing docs/code rather than creating speculative pages.
+
+### Rationale
+Maintains minimal, reviewable diffs and avoids inventing unverified documentation surfaces.
+
+## Decision 3
+Create canonical `docs/agent-handoffs/` in-repo.
+
+### Rationale
+Scheduler/TORCH prompts require this path; repo previously only had a copy under `node_modules/torch-lock/`.